Inclosing case for electric lamps.



No. 682,698. Patented Sept. l7, I90l. P. C. HEWITT.

INCLDSING CASE FOR ELECTRIC LAMPS.

(Application filed Apr. 5, 1900. Renewed Apr. 30, 1901.)

(No Model.)

Wit/1 asses.-

UNITED STATES PATENT, OFFICE.

PETER COOPER HEWITT, OF NEW YORK, YQASSIGNOR TO PETER COOPER HEWITT, TRUSTEE, OF SAME PLACE.

INCLOSING CASE FOR ELECTRIC LAMPS.

. I V l SPECIFICATION formingpart of Letters Patent Nd. 682,698, dated September 17, 1901. Application and April 5. 1900. Renewed April 30, 1901. sens No. 58,184. (No man.)

To all whom it may concern:

.Be it known that I, PETER CO PERHEWITT, a citizen of. the United States, and a resident of New York, in the county of New York and State of New York, haveinvented certain new and useful Improvements in Inclosing Cases for Electric Lamps, of which the following is a specification.

-My invention relates to the class of apparatus employed for electric lighting in which an inclosedbodyof vapor or gas is employed as the light-emitting material.

Theobject of the invention is to provide a suitable inclosing and holding case for the lamp. A convenient form of such lamp is a straight tube having in some cases an enlarge- 'ment at its upper end servingas a coolingchamber. 7 v

The general plan of the invention is to provide a transparent inclosing case ofsuflicient size tosurropnd' the lamp and protect itand also utilize the caseas a means whereby the heat radiated by the lamp may be regulated, as variations in temperature of the lamp give variations in the consumption of current. This transparent case is held in position by a suitable ventilating-cap.

In the drawing illustrating the invention,

- 1 represents'the main or tubular portion of the lamp. It is provided with two electrodes,

(showh at 2 and'5.) These are provided with.

leading-in wires 7 and 8, respectively. The

lamp is shown with an enlargement 4at its upper end constituting a cooling-chamber. Th is enlargement, however, is not always re- Y qulred. A band 9, of conducting material,

surrounding the lamp near the electrode 5, is shown as being connected by a conductor 13 with the leading-in wire '1. Surrounding the lamp is a tube 10, of transparent material,

' and it may be provided with ventilating-openlugs 11 at the bottom; The upper end of the tube is shown as being provided'with an overhanging flange 12, which is received by suits able screws or arms 14, extending inwardly from, the bottom of a supporting cap or hood 15, of any suitable material. In some instances the hood is made of brass or other metal; but it maybe of glass. Any suitable means may be employed-such, .for instance,

as a ring 16--for supporting the hood. The lamp itself is supported within the case in any convenient manner. In the drawing I have shown the leading-in wires 7 and 8 as being connected with the respective terminals of a contact-plug 19, similar to those used in con-.

nection with the ordinary incandescent electric lamps. The hood 15 may carry a socket 20,similar to the ordinary lamp-socket,adapted. to receive the contact-plug. Suitable bindin g-poles 17 and 18 are connected with the re spective terminals of the lamp-socket, so that by inserting the lamp into the hood andfastiming the plug into the socket in the usual way the lamp-terminals will be connected with the respective binding-posts. This case serves to protect the lamp and also to prevent sudden changes of temperature due to the surrounding air. In someinstances it is do sirable to maintain a fairly high temperature around the tube, and the openings may in some cases be dispensed with or bemade so .as'to be capable of regulation-as, for instance, by a slide 21, adapted to vary the size of the openings 22in the hood 15. The inclosing case maybe of plain glass, opal, or 1 ing the current consumption. of the lamp through the heat radiation.

2. The combination with a vapor or gas lamp whose current consumption is varied by the temperature of the lamp, of a protectingcase consisting in whole or in part of transparent material having ventilating-openings, means for holding the lamp therein, means for making electrical connection with the lamp, means for supporting the same, and

means for varying the heat-radiatin g capacity of thecase.

3. The combination with a vapor or gas lamp of the character described, of a protect- .ing-case consisting of transparentmaterial,

hnving ventilating-openings, a cap for the York and State of New York, this 23d day of said case containing a support for the lamp, March, A. D. 1900. the said support carrying means for makin" electrical connection with the lamp, am i PETER COOPER HEWIT l 5 means for varying the heat-radiatin g capacity Witnesses:

of the case. l WM. H. OAPEL,

Signed at New York, in the county of New 1 CHARLES B. HILL. 

